Boileb



D. M. NAISMITH.

BOILER.

APPLICATION HLED MAR-14.1921.

Patented Aug. 22, 1922.

lo l

IN V EN TOR.

o war/W BY ATTOR UNITED STATES PATENT OFFICE.

BOILER.

Specification of Letters Patent.

Patented Aug. 22, 1922.

Application filed March 14, 1921. Serial No. 452,173.

the construction of water tube boilers, and

more particularly that class of boilers wherein superimposed drums orheads are connected with lower headers of the standard horizontal orinclined water tube boilers of the Heine, Babcock and VVilcoX or otheryp The particular feature of the invention involved herein is theprovision and inc0rporation with a horizontal boiler of a druminterposed between adjacent steam drums and in the course of circulationof steam, or of steam and water, in its passage to the final steamcollecting drum, whereby to provide an intermediate separating chamberfor effecting complete separation of any entrained water from the steamand delivery of resulting dry steam at the steam nozzle,

even though the feed water may contain impurities which would causefoaming or priming in other constructions of boilers.

The invention has in view to effect such desirable separation ofentrained water from the steam and also the prevention of any waterentering the superheater, if used.

The present invention is generally similar in the construction andarrangement of the several drums and connections, to that disclosed inmy prior application filed February 1 1-, 1921, Serial bio/444,678.

In the drawings, illustrating one preferred embodiment of the invention,the boiler and setting is shown in longitudinal section through thecomplete boiler settin it being understood that the extent of theseveral drums and their banks of tubes may be to any desired extentcrosswise of the boiler unit, and'that further illustration of suchconstruction is unnecessary to those familiar with this art.

In the drawings,

Fig. 1 is a view in cross section through a boiler setting constructed.according to my invention; and

Fig. 2 is a partial cross section on the line II-II of Fig. 1. I

The entire boiler unit, as is usual, is onclosed within a settingutilizing supporting and closing walls 2 with any suitable furnaceconstruction 3, and, if desired, fuel supply mechanism 4 of anyappropriate type. Suitable outlet connection for the gases of combustionleading to the stack are, ofcourse, utilized but are not necessarilyherein specifically illustrated or described. The construction asillustrated utilizes a main upper water inlet and steam supply drum 5,anupper water and steam drum 7, and an intermediate steam separatingdrum 8. Primary drum 5 is connected by a bank or series of tubes 9 withthe lower header 6 of a Water tube boiler of the horizontal type, anddrum 7 is similarly connected by tubes 10 with the opposite or upperheader 11. This arrangement provides for circulation of the waterdownwardly through tubes 9 to header 6, through tubes ato header 11,thence upwardly through tubes 10 to drum 7, from which the water andsteam then pass eventually to primary drum 5.

.Drum 8, which is the novel feature of the invention, is locatedentirely outside of the water circulatory system, and is furthermoreelevated entirely above the water level of drums 5 and 7. As shown, drum5 is also considerably higher and with a proportionately greater openarea than drum 7, the

cross area of which is submerged to about its middle, as shown. Seriesof tubes 12 connect the upper portion of drum 7 with drum 8 for carryingover into said drum steam from drum 7 ,together with any entrained watertherein.

Similar tubes 13 connect the opposite side of drum 8 with primary drum5, whereby dry steam disassociated from any water content whatever, iscarried over from drum separated from the steam in drum 8 is returneddirectly to the water circulatory system through drum 5. In a similarmanner, series of tubes 16 connect drum 7 with drum 5 preferably belowthe water level of each, whereby to provide'for transverse circulationof water fromfone to the other.

The lowermost header 6 is provided with a blow-oil and drain pipe 17 forthe purpose ofcompletely emptying the entire boiler, cleaning out mud,etc. Baillie plates or walls 18,19, arelocated at the positionsillustrated, whereby to provide forproper circulation of the gases ofcombustion, as indicated by the arrows through the several banks oftubes at successive zones of the heating system, as well as against thelower header 6, the gases finally passing out-underneath upper drum 5 tothe outlet stack.

Incidentally, drum 8 may be provided with a deflecting-or baffle plateor abutment 22 whereby to interfere with the direct progress of steam,or steam and water passing over through tubes 12,;so as to break up itspassage directly to-the tubes 13 leadingto drum 5. By this construction,any remain sirable circulation of steam and water effected by theconstruction within and through the several elements above described,will be appreciated from. the fact that the steam is first retrieved orcollected in the substantiallyhalf drum space of drum 7, from whence itis. then carried over into the full area or space of drum 8, reservedentirely for; steam where complete and positive separation of anyentrained wateris effected. From this drum, it isthen. conveyed over tothe comparatively large space of drum 5 which is considerably more thanhalf of its cross sectional. area or drum, space, so that the tendencyof the steam to separate from any associated water and to collect in anentirely dry form in the final delivery; drum 5 is, positively assistedand. effected. Feed watcr'maybe initially supplied to the circulation bya pipe 23, connected with; drum 5 below. the water line, as shown Byreason of the construction and arrangement-of the three d-ru'ms 7, 8 and5, and

oftubes 13, the velocity of the steam is slowed, downrto a comparativelylow rate in drum Bend also in drumi steam it reaches the steam nozzle.Drum 8 being thus isolated entirely out of the water circulatory system,offers its full volume for the slow ing down and water separatingprocess.

The baffle 24, as shown in Fig. 1, completely encloses the space betweendrums 7 tubes of the vertical type of boiler shown,

and but a small portion ofthe water was carried over through the tubes16 to primary drum 5. In the present construction, all of thewater fromupperheader 11 passes into drum 7 mary drum 5 by tubes 16, so that thesetubes may, if desired, be proportionately increased in number, as willbe readily understood,

while the ample steam cavity of drum 7 ensures the constant supply todrum 8.

The construction and operation of the boiler will be readily imde'rstoodand apple ciated by all those familiar with the art. The generalarrangement of the several drums and circulating tubes provides forample and thoroughapplication of theheat of the furnace gases. Theentire construction is very compact in design and the steam generatingelements have their heating surfaces so presented to the path of thegases that they are utilized in the most efficient way. The severalelements are proportion ately arranged for the best results as toinstallation, location of the several baffling Walls, repair. orreplacement of tubes, etc. The drum 8 provides for complete separa tionof the entrained water from the steam and consequent delivery of drysteam'even though the feed water might contain imand is carried over to.the pripurities which would cause foaming or priming in. other boilers.

A great advantage in this respect is the prevention of slugs orentrained water entering the super-heater, when asuper-heater is used.As will be seen, ample space is proi vided for installation of anystandard or suitable type of the latter.

A further advantage is in the possibility of obtaining a: superheatingeffect during the travel of the steam from drum 7 through tubes12tordrum 8 and from drum 8 through tubes 13 to drum 5,.by rearrangingthe baffling 24; Thus,the battling may be used to close off a portiononly of the heating surfaces or may be omitted entirely, and theresuiting super heating efl'ect correspondingly regulated. i

The rear bank of tubers-9 icontnibut'es'to economy of the heat, while anuninterrupted circulation is provided through tubes at from header 6 toheader 11, in the zones of greatest heat. The invention as incorporatedprovides amply for very eflicient battling location and furnaceinstallation within any given space.

lVhat I claim is:

1. In combination with a horizontal boiler having terminal headers; awater circulation drum for each header and directly connected therewith,and an intervening steam separating drum having a steam receivingconnection with one ofsaid drums and a steam supply connection with theother.

2. In combination with a horizontal boiler having terminal headers; awater circulation drum for each header and directly connected therewithand with each other, and an intervening steam separating drum having asteam receiving connection with one of said drums and a steam supplyconnection with the other.

3. In combination with a horizontal boiler having terminal headers; awater circula tion drum for each header and directly connectedtherewith, and an intervening steam separating drum elevated beyond thewater level and having a steam receiving connection with one of saiddrums and a steam supply connection with the other.

4. The combination with a water tube boiler of the horizontal typehaving a lower and an upper terminal header, of a water 0' culation drumfor each header in circulation therewith and directly connected witheach other, and an intervening steam sepa rating drum above the waterlevel thereof directly connected to one of said drums by steam receivingtubes and directly connected to the other of said drums by steam supplytubes.

5. The combination with a water tube boiler of the horizontal typehaving a lower and an upper terminal header, of a water circulation drumfor each header directly connected with the uppermost portion of eachheader respectively, a transverse bank of water circulating tubesextending across between said water circulating drums, and a steamseparating drum between said drums above the water level thereof andhaving a bank of steam circulating receiving tubes at one side directlyconnected with one of said water drums and a bank of steam circulatingsupply tubes at the other side directly connected with the other of saiddrums.

6. The combination with a water tube boiler of the horizontal typehaving a lower and an upper terminal header, of a water circulation drumfor each header directly connected with the uppermost portion of eachheader respectively, a transverse bank of water circulating tubesextending across between said water circulating drums, and a steamseparating drum between said drums above the water level thereof andhaving a bank of steam circulating receiving tubes at one side directlyconnected with one of said water drums a bank of steam circulatingsupply tubes at the other side directly connected with the other of saiddrums, and additional drainage tubes leading from the lower portion ofthe steam separating drum to the water drum of the lower header.

In testimony whereof I hereunto afiix my signature.

DONALD M. NAISMITH.

